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Former United Nations chief Ban Ki-Moon warned Tuesday that the world is at the "point of no return" on climate change as he launched an international commission on responses to global warming.

The world must choose from two paths: one that could lead to a "more climate resilient future," said Ban, the U.N. secretary-general from 2007 to 2016 .

On current trends, Earth is on track to warm up an unlivable three or four degrees Celsius above preindustrial levels, far about the 1.5 C climate-safe threshold endorsed last week by the U.N. in its climate change assessment.

International efforts to create a united front to tackle global warming have been hit by the U.S.'s withdrawal from the Paris climate pact, with U.S. President Donald Trump again questioning climate change Monday.